[Ur] Calculate difference between old and new database schemas

[Sergey Mironov]

Hi. Lets say that Ur/Web application uses the database created by the
App.sql script.   After some period of time, we updated the new
version of application with new DB schema. Lets call it App'.sql. Is
there a tool that may calculate the difference between App.sql and
App'.sql? I assume that Diff.sql should contain ALTER TABLE
instructions, probably DROP TABLE/CREATE TABLE instructions.

Regards,
Sergey